remove re-export of parking_lot in util (#6435)

ethcore/src/engines/validator_set/contract.rs

@@ -18,6 +18,7 @@
 /// It can also report validators for misbehaviour with two levels: `reportMalicious` and `reportBenign`.
 
 use std::sync::Weak;
+use parking_lot::RwLock;
 use util::*;
 
 use futures::Future;

ethcore/src/engines/validator_set/multi.rs

@@ -19,7 +19,8 @@
 use std::collections::BTreeMap;
 use std::sync::Weak;
 use engines::{Call, Engine};
-use util::{Bytes, H256, Address, RwLock};
+use parking_lot::RwLock;
+use util::{Bytes, H256, Address};
 use ids::BlockId;
 use header::{BlockNumber, Header};
 use client::{Client, BlockChainClient};

ethcore/src/engines/validator_set/safe_contract.rs

@@ -21,6 +21,7 @@ use futures::Future;
 use native_contracts::ValidatorSet as Provider;
 use hash::keccak;
 
+use parking_lot::RwLock;
 use util::*;
 use util::cache::MemoryLruCache;
 use rlp::{UntrustedRlp, RlpStream};